Research

Original SEO research from my own sites

Every study here uses data I collected myself, and each one shows its sample, window and headline figure up front.

Studies
12
Catalogued items
21
Last checked

Recurring study

I add a row each time Google confirms a core or spam update.

  • Headline figure

    35 of 57

    eligible sites rose by 20% or more after the September 2026 spam update

    Date
    , updated
    Window
    Every confirmed core and spam update from June 2025 to September 2026. Each compares 14 days before with 14 days that start 7 days after the rollout ends.
    Sample
    100 owned Search Console properties. Between 9 and 66 are eligible per update. Rows with fewer than 30 sites show counts only.
    Note
    I add a row about four weeks after Google marks an update complete. The same page holds a 21-site table of four unexplained drops between 20 June and 15 September 2026.
    Download
    No file. The tables are on the study page.

Original studies

Newest first. Each describes my own sites or my own pulls, and none describes the web.

Withdrawn

I keep withdrawn work online, marked, so you can see what changed.

Reference lists

A reference list is a working tool I version and publish. It is not a study and has no headline figure.

The AI referral sources list for GA4 is version 1.0, dated 2 November 2026, and its JSON file is in the data catalogue.

Where are the statistics roundups?

They are in the statistics library, whose figures mostly come from other organisations. That library also lists several of my own studies.

The statistics hub lists them with the source and date of each figure.

Want this kind of check on your own site? The free 20-minute diagnosis is at /contact/.